You won't see any real-world difference by switching to a different kit. The only difference you'll see is in benchmarks and the appearance of the heat-spreaders. Gaming and applications there is zero difference. You could run at 1000MHz or 1800MHz and there would be absolutely no difference in terms of real-world performance, nadda. If the Stiletto kit is the cheapest, I would stick with it. I went with the cheapest kit with heat-spreaders I could find at the time of purchasing my recent build, and that happened to be the 8GB Stiletto kit.

__________________For my part I know nothing with any certainty, but the sight of the stars makes me dream.